/*
 * iperf, Copyright (c) 2014, 2015, 2016, 2017, The Regents of the University of
 * California, through Lawrence Berkeley National Laboratory (subject
 * to receipt of any required approvals from the U.S. Dept. of
 * Energy).  All rights reserved.
 *
 * If you have questions about your rights to use or distribute this
 * software, please contact Berkeley Lab's Technology Transfer
 * Department at TTD@lbl.gov.
 *
 * NOTICE.  This software is owned by the U.S. Department of Energy.
 * As such, the U.S. Government has been granted for itself and others
 * acting on its behalf a paid-up, nonexclusive, irrevocable,
 * worldwide license in the Software to reproduce, prepare derivative
 * works, and perform publicly and display publicly.  Beginning five
 * (5) years after the date permission to assert copyright is obtained
 * from the U.S. Department of Energy, and subject to any subsequent
 * five (5) year renewals, the U.S. Government is granted for itself
 * and others acting on its behalf a paid-up, nonexclusive,
 * irrevocable, worldwide license in the Software to reproduce,
 * prepare derivative works, distribute copies to the public, perform
 * publicly and display publicly, and to permit others to do so.
 *
 * This code is distributed under a BSD style license, see the LICENSE
 * file for complete information.
 */
#ifndef __IPERF_H
#define __IPERF_H

#include "iperf_config.h"

#include <sys/time.h>
#ifdef HAVE_STDINT_H
#include <stdint.h>
#endif

#include "lwip/sockets.h"
#define _GNU_SOURCE

#if defined(HAVE_CPUSET_SETAFFINITY)
#include <sys/param.h>
#include <sys/cpuset.h>
#endif /* HAVE_CPUSET_SETAFFINITY */

#include "timer.h"
#include "queue.h"
#include <cJSON.h>
#include <osdep_service.h>

#define IPERF3_DBG_ON 0
#if IPERF3_DBG_ON
#define IPERF3_DBG(fmt, args...)    printf("\n\r%s: " fmt, __FUNCTION__, ## args)
#define IPERF3_DBG_INFO(x)     printf(x)
#else
#define IPERF3_DBG(fmt, args...)
#define IPERF3_DBG_INFO(x)
#endif

extern unsigned char g_server_terminate;
extern unsigned char g_client_terminate;
extern struct task_struct g_server_task;
extern struct task_struct g_client_task;

typedef uint64_t iperf_size_t;

struct cpu_utils {
	char *task_name;
	u32  count;
	u8 util;
};

struct iperf_interval_results {
	iperf_size_t bytes_transferred; /* bytes transfered in this interval */
	struct timeval interval_start_time;
	struct timeval interval_end_time;
	float     interval_duration;

	/* for UDP */
	int       interval_packet_count;
	int       interval_outoforder_packets;
	int       interval_cnt_error;
	int       packet_count;
	double    jitter;
	int       outoforder_packets;
	int       cnt_error;

	int omitted;
#if (defined(linux) || defined(__FreeBSD__) || defined(__NetBSD__)) && \
	defined(TCP_INFO)
	struct tcp_info tcpInfo; /* getsockopt(TCP_INFO) for Linux, {Free,Net}BSD */
#else
	/* Just placeholders, never accessed. */
	char *tcpInfo;
#endif
	int interval_retrans;
	int interval_sacks;
	int snd_cwnd;
	TAILQ_ENTRY(iperf_interval_results) irlistentries;
	void     *custom_data;
	int rtt;
	int rttvar;
	int pmtu;
};

struct iperf_stream_result {
	iperf_size_t bytes_received;
	iperf_size_t bytes_sent;
	iperf_size_t bytes_received_this_interval;
	iperf_size_t bytes_sent_this_interval;
	iperf_size_t bytes_sent_omit;
	int stream_prev_total_retrans;
	int stream_retrans;
	int stream_prev_total_sacks;
	int stream_sacks;
	int stream_max_rtt;
	int stream_min_rtt;
	int stream_sum_rtt;
	int stream_count_rtt;
	int stream_max_snd_cwnd;
	struct timeval start_time;
	struct timeval end_time;
	struct timeval start_time_fixed;
	double sender_time;
	double receiver_time;
	TAILQ_HEAD(irlisthead, iperf_interval_results) interval_results;
	void     *data;
};

#define COOKIE_SIZE 37		/* size of an ascii uuid */
struct iperf_settings {
	int       domain;               /* AF_INET or AF_INET6 */
	int       socket_bufsize;       /* window size for TCP */
	int       blksize;              /* size of read/writes (-l) */
	uint64_t  rate;                 /* target data rate for application pacing*/
	uint64_t  fqrate;               /* target data rate for FQ pacing*/
	int	      pacing_timer;	    /* pacing timer in microseconds */
	int       burst;                /* packets per burst */
	int       mss;                  /* for TCP MSS */
	int       ttl;                  /* IP TTL option */
	int       tos;                  /* type of service bit */
	int       flowlabel;            /* IPv6 flow label */
	iperf_size_t bytes;             /* number of bytes to send */
	iperf_size_t blocks;            /* number of blocks (packets) to send */
	char      unit_format;          /* -f */
	int       num_ostreams;         /* SCTP initmsg settings */
	char      *authtoken;           /* Authentication token */
	int	      connect_timeout;	    /* socket connection timeout, in ms */
};

struct iperf_test;

struct iperf_stream {
	struct iperf_test *test;

	/* configurable members */
	int       local_port;
	int       remote_port;
	int       socket;
	int       id;
	/* XXX: is settings just a pointer to the same struct in iperf_test? if not,
		should it be? */
	struct iperf_settings *settings;	/* pointer to structure settings */

	/* non configurable members */
	struct iperf_stream_result *result;	/* structure pointer to result */
	Timer     *send_timer;
	int       green_light;
	int       buffer_fd;	/* data to send, file descriptor */
	char      *buffer;		/* data to send, mmapped */
	int       diskfile_fd;	/* file to send, file descriptor */
	int	      diskfile_left;	/* remaining file data on disk */

	/*
	 * for udp measurements - This can be a structure outside stream, and
	 * stream can have a pointer to this
	 */
	int       packet_count;
	int	      peer_packet_count;
	int       omitted_packet_count;
	double    jitter;
	double    prev_transit;
	int       outoforder_packets;
	int       omitted_outoforder_packets;
	int       cnt_error;
	int       omitted_cnt_error;
	uint64_t  target;

	struct sockaddr_storage local_addr;
	struct sockaddr_storage remote_addr;

	int (*rcv)(struct iperf_stream *stream);
	int (*snd)(struct iperf_stream *stream);

	/* chained send/receive routines for -F mode */
	int (*rcv2)(struct iperf_stream *stream);
	int (*snd2)(struct iperf_stream *stream);

//    struct iperf_stream *next;
	SLIST_ENTRY(iperf_stream) streams;

	void     *data;
};

struct protocol {
	int       id;
	char      *name;
	int (*accept_iperf)(struct iperf_test *);
	int (*listen_iperf)(struct iperf_test *);
	int (*connect_iperf)(struct iperf_test *);
	int (*send_iperf)(struct iperf_stream *);
	int (*recv_iperf)(struct iperf_stream *);
	int (*init)(struct iperf_test *);
	SLIST_ENTRY(protocol) protocols;
};

struct iperf_textline {
	char *line;
	TAILQ_ENTRY(iperf_textline) textlineentries;
};

struct xbind_entry {
	char *name;
	struct addrinfo *ai;
	TAILQ_ENTRY(xbind_entry) link;
};

struct iperf_test {
	char      role;                             /* 'c' lient or 's' erver */
	int       sender;                           /* client & !reverse or server & reverse */
	int       sender_has_retransmits;
	struct protocol *protocol;
	signed char state;
	char     *server_hostname;                  /* -c option */
	char     *tmp_template;
	char     *bind_address;                     /* first -B option */
	TAILQ_HEAD(xbind_addrhead, xbind_entry) xbind_addrs; /* all -X opts */
	int       bind_port;                        /* --cport option */
	int       server_port;
	int       omit;                             /* duration of omit period (-O flag) */
	int       duration;                         /* total duration of test (-t flag) */
	char     *diskfile_name;			/* -F option */
	int       affinity, server_affinity;	/* -A option */
#if defined(HAVE_CPUSET_SETAFFINITY)
	cpuset_t cpumask;
#endif /* HAVE_CPUSET_SETAFFINITY */
	char     *title;				/* -T option */
	char     *congestion;			/* -C option */
	char     *congestion_used;			/* what was actually used */
	char     *remote_congestion_used;		/* what the other side used */
	char     *pidfile;				/* -P option */

	char     *logfile;				/* --logfile option */
	FILE     *outfile;

	int       ctrl_sck;
	int       listener;
	int       prot_listener;

	int	      ctrl_sck_mss;			/* MSS for the control channel */
	char     *server_rsa_private_key;
	char     *server_authorized_users;

	/* boolean variables for Options */
	int       daemon;                           /* -D option */
	int       one_off;                          /* -1 option */
	int       no_delay;                         /* -N option */
	int       reverse;                          /* -R option */
	int	      verbose;                          /* -V option - verbose mode */
	int	      json_output;                      /* -J option - JSON output */
	int	      zerocopy;                         /* -Z option - use sendfile */
	int       debug;				/* -d option - enable debug */
	int	      get_server_output;		/* --get-server-output */
	int	      udp_counters_64bit;		/* --use-64-bit-udp-counters */
	int       forceflush; /* --forceflush - flushing output at every interval */
	int	      multisend;

	char     *json_output_string; /* rendered JSON output if json_output is set */
	/* Select related parameters */
	int       max_fd;
	fd_set    read_set;                         /* set of read sockets */
	fd_set    write_set;                        /* set of write sockets */

	/* Interval related members */
	int       omitting;
	double    stats_interval;
	double    reporter_interval;
	void (*stats_callback)(struct iperf_test *);
	void (*reporter_callback)(struct iperf_test *);
	Timer     *omit_timer;
	Timer     *timer;
	int        done;
	Timer     *stats_timer;
	Timer     *reporter_timer;

	double cpu_util[3];                            /* cpu utilization of the test - total, user, system */
	double remote_cpu_util[3];                     /* cpu utilization for the remote host/client - total, user, system */

	int       num_streams;                      /* total streams in the test (-P) */

	iperf_size_t bytes_sent;
	iperf_size_t blocks_sent;
	char      cookie[COOKIE_SIZE];
//    struct iperf_stream *streams;               /* pointer to list of struct stream */
	SLIST_HEAD(slisthead, iperf_stream) streams;
	struct iperf_settings *settings;

	SLIST_HEAD(plisthead, protocol) protocols;

	/* callback functions */
	void (*on_new_stream)(struct iperf_stream *);
	void (*on_test_start)(struct iperf_test *);
	void (*on_connect)(struct iperf_test *);
	void (*on_test_finish)(struct iperf_test *);

	/* cJSON handles for use when in -J mode */\
	cJSON *json_top;
	cJSON *json_start;
	cJSON *json_connected;
	cJSON *json_intervals;
	cJSON *json_end;

	/* Server output (use on client side only) */
	char *server_output_text;
	cJSON *json_server_output;

	/* Server output (use on server side only) */
	TAILQ_HEAD(iperf_textlisthead, iperf_textline) server_output_list;

};

/* default settings */
#define PORT 5201  /* default port to listen on (don't use the same port as iperf2) */
#define uS_TO_NS 1000
#define SEC_TO_US 1000000LL
#define UDP_RATE (1024 * 1024) /* 1 Mbps */
#define OMIT 0 /* seconds */
#define DURATION 10 /* seconds */

#define SEC_TO_NS 1000000000LL	/* too big for enum/const on some platforms */
#define MAX_RESULT_STRING 4096

#define UDP_BUFFER_EXTRA 1024

/* constants for command line arg sanity checks */
#define MB (1024 * 1024)
#define MAX_TCP_BUFFER (512 * MB)
#define MAX_BLOCKSIZE MB
/* Minimum size UDP send is the size of two 32-bit ints followed by a 64-bit int */
#define MIN_UDP_BLOCKSIZE (4 + 4 + 8)
/* Maximum size UDP send is (64K - 1) - IP and UDP header sizes */
#define MAX_UDP_BLOCKSIZE (65535 - 8 - 20)
#define MIN_INTERVAL 0.1
#define MAX_INTERVAL 60.0
#define MAX_TIME 86400
#define MAX_BURST 1000
#define MAX_MSS (9 * 1024)
#define MAX_STREAMS 128

#endif /* !__IPERF_H */
